The programming software for the VS Series is the Ladder Master S.
Yes, it could support the Windows 8.1.
After install the Ladder Master S, the driver of VS should ready to use. If the computer does not found its driver, please connect to the PLC and go to the Windows' Device Manager then there is an exclamation mark at the VIGOR PLC VS Series. Manually to renew the driver under “C:\Program Files\Vigor\Ladder Master S\VigorUSB” (the route may vary when installation). It will change to VS PLC that means the driver is ready.